Every year there's problem on mom's car with factory chrome wheels. Supposedly chrome doesn't seal against tire so they leak and you have to fill them up every couple of days. Would a can of fix-a-flat work for fixing something like that?

Tire outfits won't fix a tire that has fixaflat in it. Best bet would be to dismount the tires, Clean, sand and clearcoat the inside of the rims. Replace the valve stems and remount the tires with a little bead sealer. If the tire beads are damaged, replace the tires or put tubes in them. If that sounds like to much work, just put tubes in them.
I don't recommend Fixaflat, Slime or any other shortcut except for ATVs and then only Gel .

I would only add that a clear would possibly only recreate the original problem...??

First...
Have the shop dunk the inflated assembly to find the source of the leaking area. Inspect the tire bead and the wheel surface in the problem area.

Use some Scotchbrite cloth on the area past the area outward of the lil bump on both outter edges of the wheel. There could be some corrosion there creating the problem. Regardless the scuffed up surface should help.

There is some stuff made just for that.They had it at the dealership I worked at.I can not remember the name of it.It,s a black liquid.
You dismount the tires and paint it the inside of the rim and remount the tire and re balance.

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